a$).$Define refraction in the context of computer graphics $(3$ marks$)$

a$)$ Discuss two applications of refractions in rendering transparent materials. $(4$ marks$)$

b$)$ Discuss four techniques and algorithms used for surface modelling in computer graphics.

$(8$ marks$)$

c$)$ Explain the concept of surface scattering $($BSDFs$)$ and its significance in achieving ealistic

material appearance. $(5$ marks$)$